Little OT, sorry
I translated a swedish text via Google
"On September 3, 1967 at 06:00 Sweden went over to right-hand traffic. Sweden's transition to driving on the right was the biggest reform of the traffic area conducted sometime somewhere. Directly involved in the transition to driving on the right were 8,000 police officers and military police. Moreover contributed 100 000 counselors from clubs and schools.
Already in 1718 introduced Charles XII hand traffic. But in 1734, when Frederick of Hesse was king, was introduced on the left. In 1955 we had the referendum on the right-hand or left-hand traffic, 82.9 percent of the voters turned to the right traffic. Despite this, parliament decided in 1963 on the transition to driving on the right."
